5x 10 or 5 x 5 plywood

does anybody know where i can go and buy without having to buy a unit ( pallet ) of plywood......i have been to some of the lumber yards here in oklahoma city and i have to buy full stacks or units and the big box stores just just say no they cannot get they dont even try to help me out....these sizes would be some much more easier to use than splicing 4 x 8 sheets....any suggestions...thanks